If any army needs it, it's Beasts. And some new models! I still wish they would do a little integration between all the chaos books. I didn't think I was a fan of the old mix 'n match action but I do miss it a little.

I've heard it may actually be the other way around. From what I understand Tomb Kings just need a new book and some rule tweaks. Beasts are getting almost completely redesigned so it may take longer. Add in the new Minotaur and Dragon Ogre plastics and it may take a while.